The octopus or octopi (plur.)
The riddle describes a creature from mythology known as a three-headed dog, often associated with the underworld, like Cerberus from Greek mythology. In a more playful interpretation, it could refer to a three-headed creature in a fictional context. The combination of three heads, two hearts, and four legs creates an interesting and fantastical image, but it doesn't correspond to any known real-world animal.
worms mollusks
The creature you're referring to is - an octopus.
Earthworm
Of corse they do. Evrey creature needs a heart to survive and live in this world. Even plants have hearts.
Three Hearts was created in 1979-02.
Three Hearts Marathon was created in 1981.
Three Hearts for Julia was created in 1943.
ostritches lay eggs and they do not have three hearts.
An octopus has three hearts.
Three - Tubeless Hearts album - was created in 1994.
3 hearts 3 hearts